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Finding the Fourth Proportional to 39,891.77, 55,050.36 and 21,986.78

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Solution

The fourth proportional to 39,891.77, 55,050.36 and 21,986.78 is: 30,341.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,891.77 : 55,050.36 = 21,986.78 : x
  2. Step 2: Convert to fraction form
    39,891.77/55,050.36 = 21,986.78/x
  3. Step 3: Cross multiply
    39,891.77x = 55,050.36 × 21,986.78
  4. Step 4: Simplify right side
    39,891.77x = 1,210,380,154.24
  5. Step 5: Solve for x
    x = 1,210,380,154.24/39,891.77
  6. Step 6: Final answer
    x = 30,341.60

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.